TR8464 is your best bet. It leaves Cambridge at 11:21 on Sunday and arrives in Stevenage at 12:10.
May I please have the price for this train?
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hotel-day hotel-name hotel-people hotel-stay train-arriveby train-day train-departure train-destination
hotel-day hotel-name hotel-people hotel-stay train-arriveby train-day train-departure train-destination
hotel-day hotel-name hotel-people hotel-stay train-arriveby train-day train-departure train-destination